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The @Hover_the_Game devs have not explained how FRIENDS work in detail but I’m starting to figure it out.
When you connect online you are given a Cross-Platform key, this is an identity for the server ROOM.
If you want to play with friends online...
(Cont.)
pic.twitter.com/PuYrRT4PEg
PAUSE the game and in the lower right is a 
PENCIL icon.
You will be shown your current Cross-Platform key. However, you can also ‘Enter Join Key’.
Right now my key is o1b68a.
Add this 
key & you will join my room at this current moment.
Try it.
pic.twitter.com/bKgJP1qRHF
... now if you check your current key it is the key you entered because the key is the room. And the room holds 16 people max.
I think I understand.
pic.twitter.com/CyXdzNXBr9
So all we need to do in order to play together is to start sharing room KEYS on twitter and joining rooms!!!
pic.twitter.com/SLtGXb9Ram
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